PT-2026-53082 · Undefined · Undefined

Published 2026-06-28 · Updated 2026-06-28 · CVE-2026-58050

NVD

CVSS v3.1

7.0

High

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num attrs * sizeof(libssh2 publickey attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A malicious SSH server can then drive the attribute-parsing loop to write past the allocation, causing a heap buffer overflow in a connecting libssh2 client.

Exploit

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2026-58050

Affected Products

Undefined

References · 4

• 🔥 https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-58050 · Security Note
• https://vulncheck.com/advisories/libssh2-integer-overflow-in-publickey-subsystem-attribute-allocation · Note
• https://github.com/libssh2/libssh2/blob/master/src/publickey.c · Note